Norrisia

The marine snail Norrisia norrisii is a medium-sized gastropod mollusk within the family Tegulidae. It has several common names, including Norris's top snail, Norris's topsnail, norrissnail, smooth brown turban snail, or kelp snail. It was first described by G.B. Sowerby I under the name Trochiscus norrisii. It is the only species in the genus Norrisia.

Norrisia

Ed Bierman · CC BY 2.0 · via Wikipedia/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.

On record

Recorded, not inferred
Sits inside
TegulidaePBDB
Diet
grazerPBDB, for Trochoidea
Life habit
epifaunalPBDB, for Trochoidea
Motility
actively mobilePBDB, for Trochoidea
Vision
limitedPBDB, for Gastropoda

Time the record covers

At least 59 million years on record.

The record covers at least 59.24 Mya to 129 ka. No occurrence read is dated outside 61.66 Mya to 0 Mya.

Paleocene — about 1 of 64 occurrencesPaleoceneEocene — about 16 of 64 occurrencesEoceneOligocene — about 0 of 64 occurrencesMiocene — about 1 of 64 occurrencesMiocenePliocene — about 3 of 64 occurrencesPleistocene — about 43 of 64 occurrences63–61 Mya — about 0.4 occurrences61–59 Mya — about 0.6 occurrences48–46 Mya — about 0.8 occurrences46–44 Mya — about 0.9 occurrences44–42 Mya — about 0.9 occurrences42–40 Mya — about 5 occurrences40–38 Mya — about 8 occurrences38–36 Mya — about 0.1 occurrences13–10 Mya — about 0.1 occurrences10–8.4 Mya — about 0.2 occurrences8.4–6.3 Mya — about 0.2 occurrences6.3–4.2 Mya — about 0.9 occurrences4.2–2.1 Mya — about 4 occurrences2.1–0 Mya — about 42 occurrences59.24 Mya129 ka63 Mya0 Mya

64 occurrences of Norrisia on record, most of them in the Pleistocene. The Paleobiology Database records this as a living group. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.

When

64 occurrences

These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.

Found in

14 formations

Discovery Point — 29.00°N, 118.27°WDiscovery Point — 29.00°N, 118.23°WDiscovery Point — 29.10°N, 118.25°WGosport Sand — 31.54°N, 87.52°WGosport Sand — 31.55°N, 87.91°WPalos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.71°N, 118.27°WKosciusko — 32.04°N, 88.73°WLisbon — 31.76°N, 88.10°WQuaternary terrace — 33.75°N, 118.33°WLomita Marl — 33.75°N, 118.30°WCook Mountain — 30.62°N, 96.56°WCook Mountain — 30.64°N, 96.52°WPico — 34.33°N, 118.72°WWeches — 30.67°N, 96.37°WEwekoro — 6.92°N, 3.19°EUnnamed — 33.24°N, 119.47°WPalos Verdes — 33.63°N, 117.90°WTowsley — 34.41°N, 118.48°W

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The named rock units Norrisia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 23 occurrences have no formation on record, which is common for older literature.

Norrisia and its relatives

Pleistocene

Where Norrisia and its relatives were recorded in the Pleistocene.

Found in the same rock

1,629 taxa

The Paleobiology Database records 51 sites for Norrisia, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.

This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.

Entered from

27 references

Each of the 64 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. 15 further references are not listed. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content1

Picture of Norrisia

Credit
Ed Bierman
Licence
CC BY 2.0
Commercial use
the licence allows it

No 3D scan of Norrisia was found in MorphoSource and Sketchfab.

Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.

The description on this site

Licence
CC BY-SA 4.0

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itTegulidae through timeFormations of the PleistoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Bayle 1880